「What is the Definition of an Internet Service Provider」の版間の差分

2016年7月25日 (月) 12:59時点における版

Internet providers (ISPs) will be in almost every home and office in the modern world. But precisely what is an ISP? What in case you look for when selecting one?
An Internet service provider is really a company that connects one to the Internet, usually to get a monthly fee. Most modern ISPs offer either cable or DSL service, though there are also providers offering dial-up, satellite, fiber optic, and cellular connections. (These is going to be discussed in more detail in later sections.)




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Usually, Internet connections can be purchased at the least expense from the local phone (for dial-up or DSL) or wire (for cable or fiber optic) company. Satellite television providers offer satellite Internet connections, and cell phone carriers offer cellular Internet connections.

As mentioned earlier on, your neighborhood phone company will offer DSL or dial-up Internet connections. Both of these connections are carried within the same lines as the phone calls throughout your property.





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Dial-up connections use what is called a "circuit-switched" link with your ISP -- which is, it remains connected constantly until you close the bond. This feels like a good thing -- in fact, traditional telephone service is circuit-switched -- but this means that the line it uses can't get any other connections as long as you're on the Internet, every computer that needs a connection optimally ought to be given its line. Though few ISPs actively promote dial-up packages for consumer use due to its slow speeds, these are still available plus a good option if you need a low-speed, persistent connection, such as for the credit card line. The connection speed maximum as defined by the IEEE is 56 kilobits per second, or 56 Kbps.

A digital subscriber line, more commonly known as DSL, uses a "packet-switched" connection -- that's, your pc connects to the Internet via a DSL connection for too long enough to transmit or receive information, then drops the link with free up for other computers to utilize. This process of acquiring and dropping the link is transparent, because you don't have to a single thing but surf the Internet for it to work. DSL is faster than dial-up, starting from 128 Kbps to 8 megabits per second, or Mbps. DSL, like its predecessor dial-up, allows for a private connection, which ensures that the computers on your neighborhood network will be the only ones that are on your connection all the way to the ISP. However, the connection speed can differ depending about the distance in your ISP. This connection type is better used in an exclusive home or even a small to medium business setting.

Cable-based Internet providers change from phone-based Internet providers in this the Internet signal travels through the copper wire that runs into your home to provide cable. Like DSL, this is a packet-switched connection. Cable is comparable to DSL rolling around in its speeds, even though the maximum speed that cable can offer can go all the way to 27 Mbps. One thing which makes cable completely different from DSL, though, is the fact it is usually a shared connection ' which is, everyone in your area who is also using cable internet in my area is employing the same bandwidth when the signal leaves your home to the time it reaches the ISP. Because of this, speeds could be affected by the number of people are on the network with a given time. Cable Internet is mostly best employed in the home, since the shared connection can't absolutely guarantee a speed which businesses may depend on.

Satellite Internet services are generally only practical in locations where classical services can't be deployed. As the name indicates, the service relies on a clear line of sight to your satellite orbiting planet earth. These connections would be better used by locations that are constantly on the move, such as vessels cruising, airplanes flying, or vehicles moving on land. Upload speed on the satellite connection is all about a tenth from the download speed, which peaks at about 500 Kbps.

Most mobile phone carriers offer precisely what are called "aircards", cards that plug into whether PCMCIA / PCMCIA Express slot on a laptop or desktop, or a USB modem that plugs into a USB port over a computer. These devices allow your pc to connect to some cellular network, much like your cellular phone does. Some carriers offer plans that allow you to use your cell phone itself like a modem for your personal machine. These carriers offer 3G connection speeds and/or 4G connection speeds. The actual speed itself can differ depending around the number and availability of cellular towers in the area you're in when trying in order to connect. Cellular broadband is really a very great option for mobile businesspeople and those about the go.

Most large cities have started setting up municipal Wi-Fi connections for either public use or city employees only. Even some smaller cities have these municipal networks build for emergency service use, to learn effectively for police to obtain information with a vehicle or location, and ambulances and fire services to acquire to locations by locating the optimal routes on interactive maps. When available on the public, municipal Wi-Fi relies upon hotspots, or areas included in one or more interconnected wireless access points, including wireless routers. Some of these municipal Wi-Fi networks actually offer high-speed Internet access at little cost in comparison with other, classical broadband providers, or sometimes no cost at all.
WiMAX is an emerging telecommunications technology directed at providing interconnectivity over longer distances than other types of wireless connection types. While traditional routers in a municipal network possess the range of most cell phones, WiMAX can cover areas of up to 3000 square miles and provide speeds just like DSL or cable.

Vachon, Bob and Rick Grazini. "Accessing the WAN, CCNA Exploration Companion Guide." Ch 6, pp 384-401.
Other information from author's own knowledge and experience.
Images copyright Creative Commons.